package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.result.Result;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;
    
    @Autowired
    private WorkspaceService  workspaceService;

    /*
     * @Description  统计指定时间区间内的营业额
     * @Param [begin, end]
     * @return com.sky.result.Result<com.sky.vo.TurnoverReportVO>
     **/
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
//        当前集合用于存放从begin到end的每一天的日期
        List<LocalDate> dateList = getLocalDates(begin, end);

//        存放每天的营业额
        List<Double> turnoverList=new ArrayList<>();
        for (LocalDate date : dateList) {
//            查询data日期对应的营业额数据
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map=new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover= turnover==null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();

    }

    /*
     * @Description  统计指定时间区间内的用户数据
     * @Param [begin, end]
     * @return com.sky.result.Result<com.sky.vo.UserReportVO>
     **/
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
//      当前集合用于存放从begin到end的每一天的日期
        List<LocalDate> dateList = getLocalDates(begin, end);

//        存放每天的新增用户数量
        List<Integer> newUserList=new ArrayList<>();
//        存放每天的总用户数量
        List<Integer> totalUserList=new ArrayList<>();
        for (LocalDate localDate : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);

            Map map=new HashMap();
            map.put("end",endTime);

//            总用户数量
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin",beginTime);
//            每日新增用户数量
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /*
     * @Description  统计指定时间区间内的订单数据
     * @Param [begin, end]
     * @return com.sky.vo.OrderReportVO
     **/
    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = getLocalDates(begin, end);

        List<Integer> orderCountList=new ArrayList<>();
        List<Integer> validOrderCountList=new ArrayList<>();

        for (LocalDate localDate : dateList) {
//             查询每天的订单总数
            LocalDateTime beginTime = LocalDateTime.of(localDate, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(localDate, LocalTime.MAX);
            Integer orderCount = getOrderCount(beginTime, endTime, null);
//            查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
//        计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
//        计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;

        if (totalOrderCount != 0){
//            计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                      .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /*
     * @Description  统计指定时间区间内的销量前10名
     * @Param [begin, end]
     * @return com.sky.vo.SalesTop10ReportVO
     **/
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop = orderMapper.getSalesTop(beginTime, endTime);

        List<String> names = salesTop.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /*
     * @Description  计算有多少天
     * @Param [begin, end]
     * @return java.util.List<java.time.LocalDate>
     **/
    private List<LocalDate> getLocalDates(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
//        计算日期
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }

    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status) {
        Map map=new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /*
     * @Description  导出Excel
     * @Param [response]
     * @return void
     **/
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate dataBegin = LocalDate.now().minusDays(30);
        LocalDate endData = LocalDate.now().minusDays(1);

//        查询概览数据
        BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(dataBegin,LocalTime.MIN), LocalDateTime.of(endData,LocalTime.MAX));

//        通过POI将数据写入excel文件
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
//            基于模板文件创建一个新excel文件
            XSSFWorkbook excel=new XSSFWorkbook(in);
//            获取表格文件的第一个sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
//            填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dataBegin+"至"+endData);


//            获取第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());

//            获取第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dataBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessDataVO.getTurnover());
                row.getCell(3).setCellValue(businessDataVO.getValidOrderCount());
                row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessDataVO.getUnitPrice());
                row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            }

//            通过输出流将Excel文件输出到浏览器，进行下载
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
